Hi ,
What's the OS version of your windows 10? What's the error message when you run New-NetSwitchTeam? Please post the screenshot for us to learn your situation better.
Based on my understanding, you are using third-party firewall which prevents you from creating an active/standby NIC teaming. Is it right? Please feel free to let me know if my understanding wrong.
If yes, you should contact third-party firewall's vendor to get further help.
---Please Accept as answer if the reply is helpful---
Best regards,
Candy